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shmop_size — Returns the size of a shared memory segment.


int shmop_size(shmop_id);
int shmop_id: ID of a shared memory segment


Size of the shared memory segment; FALSE on failure


shmop_size() returns the total size in bytes of the shared memory segment identified by shmop_id . This is the size that the segment was defined to have at the time it was created, and not the size of any data that may have been written to it.

If shmop_id is not a valid identifier as returned by shmop_open() , FALSE is returned.


PHP 4 since 4.0.3


Example 1183. Show the size of a shared memory segment

if (($size = @shmop_size($shm_id)) === FALSE) {
    die("Failed to get the size of the segment; reason: $php_errormsg\n");

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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